Contingencies and Significant Estimates - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Product Warranty Liability [Line Items]
Accruals for environmental matters	$ 0.8	$ 0.8
Self insurance reserve	1.3
Product liability reserves	1.3	1.4
Product liability reserves for actual cases	0.4	0.4
Product liability reserves for claims incurred but not reported	0.9	1.0
Warranty claims expected to be paid within a year or less	26.9	24.1
Warranty claims expected to be paid after one year	11.4	$ 11.9
Minimum
Product Warranty Liability [Line Items]
Self insurance reserve per occurrence	0.1
Maximum
Product Warranty Liability [Line Items]
Self insurance reserve per occurrence	0.3
Product liability self-insurance retention levels per occurrence	0.3
CANADA | Maximum
Product Warranty Liability [Line Items]
Self insurance reserve per occurrence	$ 0.1